AM-91-39 COLOR DEGRADATION OF DIESEL FUEL IN DEEP DESULFURIZATION

Description:

Severe regulations against environmental pollution were enforced in the early 1970'S in Japan, in advance of the rest of the world. They prompted the development of several environmental protection technologies in Japan, such as those for unleaded gasoline and for desulfurization of fuel oil and flue gas. Recently, the Japanese Central Council for Control of Environmental Pollution proposed a schedule of stepwise reduction of NOx and particulates in diesel emissions, whereby the sulfur content of diesel fuel must be reduced to 0.2 wt% in 1992 and 0.05 wt% in five years and later to attain the former targets of emission control. The first milestone, to reach a 0.2 wt%-S level in diesel fuel, is not difficult either in technology or economic aspects. But for the final goal of 0.05 wt%-S there are several problems to be solved more carefully than in the conventional diesel HDS unit.